Add support for denite

autoload/airline/extensions.vim

@@ -143,6 +143,11 @@ function! airline#extensions#load()
     call add(loaded_ext, 'unite')
   endif
 
+  if get(g:, 'loaded_denite', 0)
+    call airline#extensions#denite#init(s:ext)
+    call add(loaded_ext, 'denite')
+  endif
+
   if exists(':NetrwSettings')
     call airline#extensions#netrw#init(s:ext)
     call add(loaded_ext, 'netrw')

autoload/airline/extensions/denite.vim

@@ -0,0 +1,43 @@
+" MIT License. Copyright (c) 2017 Thomas Dy
+" vim: et ts=2 sts=2 sw=2
+
+scriptencoding utf-8
+
+if !get(g:, 'loaded_denite', 0)
+  finish
+endif
+
+" Denite does not use vim's built-in modal editing but has a custom prompt
+" that implements its own insert/normal mode so we have to handle changing the
+" highlight
+function! airline#extensions#denite#check_denite_mode(bufnr)
+  let l:mode = split(denite#get_status_mode(), ' ')
+  let l:mode = tolower(l:mode[1])
+  call airline#highlighter#highlight([l:mode], a:bufnr)
+  return ''
+endfunction
+
+function! airline#extensions#denite#apply(...)
+  if &ft == 'denite'
+    call a:1.add_section('airline_a', ' Denite %{airline#extensions#denite#check_denite_mode('.a:2['bufnr'].')}')
+    call a:1.add_section('airline_c', ' %{denite#get_status_sources()}')
+    call a:1.split()
+    call a:1.add_section('airline_y', ' %{denite#get_status_path()} ')
+    call a:1.add_section('airline_z', ' %{denite#get_status_linenr()} ')
+    return 1
+  endif
+endfunction
+
+function! airline#extensions#denite#init(ext)
+  call denite#custom#option('_', 'statusline', 0)
+  call a:ext.add_statusline_func('airline#extensions#denite#apply')
+
+  " airline#extensions#denite#apply normally gets called only after the
+  " denite window gets closed, so we have to call airline#update_statusline
+  " ourselves to make sure it's applied when the window is opened.
+  augroup airline_denite
+    autocmd!
+    autocmd FileType denite call airline#update_statusline()
+  augroup END
+endfunction
+